I am having trouble getting the hardware back button to do what I would like it to do for the Windows Phone 8. The app is strictly just webview, so as of now when a back (hardware) button is clicked it closes the app but i want to back just previous page. I put the the URL in constructor like below
namespace Masala
{
public partial class Entertainment : PhoneApplicationPage
{
public Entertainment()
{
InitializeComponent();
var targetUri = new Uri("http://mobile-masala.com");
WebBrowser.Navigate(targetUri);
}
}
}
Add following code in your page.xam.cs to handle back button press...
protected override void OnBackKeyPress(CancelEventArgs e)
{
if(WebBrowser.CanGoBack)// your code... check the web view that you can go back or it is the main page.
{
WebBrowser.GoBack();
e.Cancel = true;
}
}
Related
I am currently working with windows phone 8.1 [RT] application , In my application I have hide Grid Visibility from class.
For that I have create one public method on cs page
public void HideCancelButton()
{
grdCancle.Visibility = Visibility.Collapsed;
bdrCancel.Visibility = Visibility.Collapsed;
Debug.WriteLine("hide button");
//UpdateLayout();
}
and calld that method in following manner in helperClass.cs
MainPage mypage = new MainPage();
mypage.HideCancelButton();
it will debug "hide button" but doesn't hide grid
I have also use
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,() =>{});
It won't hide the grid because you are not referencing the MainPage that is currently showing.
You should get the reference to the main page wherever you are calling the HideCancelButton method.
In your case the easiest solution will be doing something like this (considering you are not calling the method from the MainPage class itself.
Frame rootFrame = Window.Current.Content as Frame;
MainPage mainPage = rootFrame.Content as MainPage;
if(mainPage != null)
{
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync
(
Windows.UI.Core.CoreDispatcherPriority.Normal,
() => { mainPage.HideCancelButton(); }
);
}
So once again we are in the process of converting our existing Java application that was using entirely Swing to using JavaFX. However, the application will not be using JavaFX entirely. This seems to be causing some issues with Alerts/Dialogs and modality. We are currently using Java 8u40.
The main application is basically in a JFrame that has a Menu. The main content pane is JDesktopPane and clicking a MenuItem opens new JInternalFrames within the DeskopPane. Screens we are converting to JavaFX are basically JFXPanels within a JInternalFrame at the moment. Any Alerts/Dialogs that are opened from the JFXPanels are modal to the panel itself, but not to the JInternalFrame, DeskopPane, Menu, etc.
I read in the DialogPane documentation that they are planning to introduce some lightweight dialogs and even possibly InternalFrames in future releases of JavaFX, so maybe we'll just have to wait it out a little longer for this functionality. But, ideally when opening a new Alert/Dialog it would be modal to the entire Application.
EDIT:
Currently doing the following for modal dialogs:
((Stage)getDialogPane().getScene().getWindow()).setAlwaysOnTop(true);
This makes the dialog always appear on top, however the dialog also remains on top of other applications even if our main application is minimized. It also does not block input to any Swing components in the frame.
You can use the following work-around which creates an invisible JDialog when the Alert is shown and disposes the JDialog when the Alert is closed. This approach extends the modality to the whole application, including the Swing part.
// create Alert
Alert alert = new Alert(AlertType.INFORMATION, "Hello");
// create invisible JDialog and "show" it
JDialog dialog = new JDialog();
dialog.setModal(true);
dialog.setUndecorated(true);
dialog.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
SwingUtilities.invokeLater(() -> dialog.setVisible(true));
// show Alert
alert.showAndWait();
// close JDialog after Alert is closed
dialog.dispose();
I don't think i understand your question completely. But here is my guess - You are trying to make an alert window from some JFXPanel that will be modal (i.e. user will not be able to click in your application until she closes that alert window) to your entire application which is written partially using swing components.
If your application would be written in purely JavaFX then you would do something like (Assuming you have created a button somewhere in your JFXPanel)
button.setOnAction(evt -> {
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.initModality(Modality.APPLICATION_MODAL);
// This will not work in your code
alert.initOwner(button.getScene().getWindow());
alert.show();
});
but since initOwner requires a javafx.stage.window object passing a swing component won't work in your code. As of Java 8u40 i don't think there is a right way(i.e. not hacks) to set ownership of Alert objects to swing component. Not surprisingly such questions has already been asked here and not answered as of writing this.
For your requirements you can use JOptionPane.showMessageDialog method and its look alike as workaround.
button.setOnAction(evt -> {
JOptionPane.showMessageDialog(desktopPane,"My message");
});
These dialog boxes are modal by default so no work is necessary. You can call these from any event handler methods of JavaFX components.
I've done a little workaround with a small interface which is implemented in my JavaFXFrame:
public interface DialogParent {
void setOnFocusGained(EventHandler<FocusEvent> focusHandler);
void setOnCloseRequest(EventHandler<WindowEvent> closeHandler);
}
And my JavaFXFrame implementation
public class JavaFXFrame implements DialogParent {
private JFrame frame;
private EventHandler<ch.irix.sumadmin.util.FocusEvent> focusGainedHandler;
private EventHandler<javafx.stage.WindowEvent> windowClosingHandler;
public void JavaFXFrame() {
final JFXPanel fxPanel = new JFXPanel();
frame = new JFrame();
frame.add(fxPanel);
frame.addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
tryClosing(this);
}
});
frame.addWindowFocusListener(new WindowAdapter() {
#Override
public void windowGainedFocus(WindowEvent e) {
if (focusGainedHandler != null) {
focusGainedHandler.handle(new FocusEvent());
}
}
});
}
public void setVisible(boolean visible) {
frame.setVisible(visible);
}
private void tryClosing(WindowListener listener) {
javafx.stage.WindowEvent windowEvent = new javafx.stage.WindowEvent(null, javafx.stage.WindowEvent.WINDOW_CLOSE_REQUEST);
if (windowClosingHandler != null) {
windowClosingHandler.handle(windowEvent);
}
if (!windowEvent.isConsumed()) {
frame.setVisible(false);
}
}
#Override
public void setOnFocusGained(EventHandler<ch.irix.sumadmin.util.FocusEvent> focusGainedHandler) {
this.focusGainedHandler = focusGainedHandler;
}
#Override
public void setOnCloseRequest(EventHandler<javafx.stage.WindowEvent> windowClosingHandler) {
this.windowClosingHandler = windowClosingHandler;
}
}
And showing an Alert:
public static void showAlert(Alert alert) {
DialogPane dialogPane = alert.getDialogPane();
final Stage stage = new Stage();
stage.setScene(dialogPane.getScene());
List<ButtonType> buttonTypes = dialogPane.getButtonTypes();
for (ButtonType buttonType : buttonTypes) {
ButtonBase button = (ButtonBase) dialogPane.lookupButton(buttonType);
button.setOnAction(evt -> {
dialogPane.setUserData(buttonType);
stage.close();
});
}
dialogParent.setOnFocusGained(event -> {
stage.toFront();
});
dialogParent.setOnCloseRequest(Event::consume);
stage.setOnCloseRequest(event -> {
dialogParent.setOnFocusGained(null);
dialogParent.setOnCloseRequest(null);
});
stage.show();
}
Hope this will help you
I'm developing a little app for Windows Phone 8 that has 2 pages (1 is of course the main page).
When page2 is reached I want to check if this page has been reached by pressing the back button on the phone. I want to do something like this:
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if (backButton.isPressed()) {
// this page has been reached by pressing the back button on the phone
} else {
// this page has been reached by NavigationService.Navigate()
}
}
Is there a native API to do that?
Is this what you need?
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (e.NavigationMode == NavigationMode.Back)
{
...
}
}
I am working on a Windows Phone 8 App which should be protected with a passcode. What is the best way to show the passcode screen everytime the app is lauchend or activated?
I think the central point of action shoule be the App.xaml.cs with its Launch and Activation event handlers. But how exactly can I show the passcode screen?
The problem is, that one never know which pages will be displayed when the app launches or is reactivated. It is either the main page or any other page which was last displayed when the app was deactivated.
I tried to intercept the navigation to the first page, cancel it and show the passcode page instead:
// App.xaml.cs
private void InitializePhoneApplication() {
...
RootFrame.Navigating += HandleFirstNavigation;
...
}
private void HandleFirstNavigation(object sender, NavigatingCancelEventArgs e) {
RootFrame.Navigating -= HandleFirstNavigation;
e.Cancel = true;
RootFrame.Dispatcher.BeginInvoke(new Action(this.OpenPasscodePage));
}
private void OpenPasscodePage() {
RootFrame.Navigate(PasscodePageUri);
}
This works, but only when the app lauchend. When the app reactivated (dormant or tombstoned) the e.Cancel is irgnored. Although the navigation to the passcode page is called the original page is shown.
Moving the navigation the the passcode page from Navigating to Navigated does not worth either:
private void InitializePhoneApplication() {
...
RootFrame.Navigated += PasscodePageAfterFirstNavigation;
...
}
private void PasscodePageAfterFirstNavigation(object sender, EventArgs e) {
RootFrame.Navigated-= PasscodePageAfterFirstNavigation;
RootFrame.Navigate(PasscodePageUri);
}
This seems to be some kind of race condition: Sometimes the passcode page is shown, sometimes the original page. Even if the passcode pages comes up this looks bad because one first see the original page for the fraction of a second before the app navigates further to the passcode page.
Both solution do not work. Any idea what is the right way to implement this?
EDIT: Meanwhile I tried a third solution which does not work either. This solution uses the Uri Mapper:
App.xaml.cs
public bool PasscodeWasConfirmed; private void Application_Launching(object sender, LaunchingEventArgs e) {
...
PasscodeWasConfirmed = false;
...
}
private void Application_Activated(object sender, ActivatedEventArgs e) {
...
PasscodeWasConfirmed = false;
...
}
public Uri InitialPageUri;
public bool ShouldRedirectToPasscodePage(Uri uri) {
if (PasswordWasConfirmend == false) {
InitialPageUri = uri;
return true;
}
return false;
}
UriMapper
public class AppUriMapper : UriMapperBase {
public override Uri MapUri(Uri uri) {
App app = (Application.Current as App);
if (app != null) {
if (app.ShouldRedirectToPasscodePage(uri))
return PasscodeQueryPage.PageUri;
}
// default
return uri;
}
}
PasscodePage
public partial class PasscodePage : PhoneApplicationPage {
...
private void PasscodeConfirmed() {
App app = (Application.Current as App);
app.PasscodeWasConfirmed = true;
NavigationService.Navigate(app.InitialPageUri);
}
}
The Logic is working without any problem, but the app does not navigate to InitialPageUri after the passcode was confirmed. The Uri Mapper is called and correctly and returns the InitialPageUri (no redirect any more). But no navigation happens...
There are no errors, exceptions or debug output. simply nothing happes...
Biggest problem when using Uri Mapper:
When the app is reactivated from Dormant state there is no navigation which could be mapped or redirected...
(I've edited previous answer instead of adding a new one)
I've spend a little time trying to find a solution, and I don't see why your code doesn't run.
In my case it's enough if I do such a change in App.xaml:
private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
{
// Set the root visual to allow the application to render
if (RootVisual != RootFrame)
RootVisual = RootFrame;
// Remove this handler since it is no longer needed
RootFrame.Navigated -= CompleteInitializePhoneApplication;
App.RootFrame.Navigate(new Uri("/passPage.xaml", UriKind.RelativeOrAbsolute));
}
This works on my example which is under the link http://sdrv.ms/1ajH40E
But - I cannot prevent user from seeing last screen when he holds back buton and is chosing to which app return, and then for a blink he can see the last page before leaving the app. I don't know if it is possible to change this behaviour after clicking MS Button:
windows phone change deactivated app image
Second edit
Ok - maybe I've found solution why it sometiems work and sometimes not in your code. After pressing the Start or Search buton the App can go to two cases: Tombstone and non-tombsone. After return different events happen. Code above works with Tombstone case but not with non-tombstone. To work it with the second you need to add (because page is not initialized again) - (of course it can be different solution):
bool afterActivation = false;
private void Application_Activated(object sender, ActivatedEventArgs e)
{
afterActivation = true;
}
private void CheckForResetNavigation(object sender, NavigationEventArgs e)
{
// If the app has received a 'reset' navigation, then we need to check
// on the next navigation to see if the page stack should be reset
if (e.NavigationMode == NavigationMode.Reset)
RootFrame.Navigated += ClearBackStackAfterReset;
if (afterActivation)
{
afterActivation = false;
App.RootFrame.Navigate(new Uri("/passPage.xaml", UriKind.RelativeOrAbsolute));
}
}
Please also ensure of your debug properties in VS: Project->Properties->Debug->Tombstone upon deactiovation checkbox.
You can also find some information here (if you haven't seen it before):
http://blogs.msdn.com/b/ptorr/archive/2010/12/11/how-to-correctly-handle-application-deactivation-and-reactivation.aspx
Very simple repro app - created a new Windows Phone 8 C# app from template in Visual Studio, added an Image to the content panel, then subscribed for NDEF proximity messages as shown:
// Constructor
public MainPage()
{
InitializeComponent();
ProximityDevice device = ProximityDevice.GetDefault();
if (device != null)
{
device.SubscribeForMessage("NDEF", handler);
}
}
private void handler(ProximityDevice sender, ProximityMessage message)
{
Debug.WriteLine("Received message");
Dispatcher.BeginInvoke(() =>
{
myImage.Source = new BitmapImage(new Uri("Assets/test.png", UriKind.Relative));
});
}
First event works fine (image source is changed successfully). However, after this event has fired once it no longer fires if I touch another NFC tag. If I remove the call to update the image source, it will fire on each touch.
I can't understand why there would be any interaction here. The phone I'm testing on is a Nokia Lumia 620.
Just a shot in the dark: try to keep reference to your ProximityDevice somewhere. Make it a member of the class and assign in constructor.
class MainPage : PhoneApplicationPage
{
private ProximityDevice device;
public MainPage()
{
InitializeComponent();
device = ProximityDevice.GetDefault();
if (device != null)
{
device.SubscribeForMessage("NDEF", handler);
}
}
...
}
As it correctly mentioned in comments, this is caused by the Garbage Collector, which collects the instance of the ProximityDevice. When new BitmapImage is created, memory consumption grows, and this triggers the GC process. That's why you don't have such issue when you don't create the image.